Numerical control machining method for self-adaptive compensation of blade root crown radial surface parallelism

The invention discloses a numerical control machining method for adaptively compensating the radial plane parallelism of a root crown of a blade, belongs to the technical field of turbine blade machining, and aims to solve the problems of poor parallelism and poor consistency of the radial plane of the root crown caused by an existing blade machining method. The method comprises the following steps of: offsetting a blade along an X axis and a Z axis, rotating the blade along the X axis and a Y axis, and compensating the position degree of a root crown, so that the blade is positioned at a set position in a jacking state of an ejector pin after finish machining is finished; the blade parts except the blade crown related surface are machined to be in a finished state; a point A1, close to the steam outlet side in the radial direction, of the blade crown back and a point A2, close to the steam inlet side in the radial direction, of the blade crown back are selected as detection points, and Z-direction fall value